Valve has released Proton 11.0-1b today, July 29, 2026. This update introduces support for Steamworks SDK 1.65. This integration is crucial for maintaining and enhancing compatibility with Windows-native games that utilize the latest Steam features. Developers integrating Steamworks SDK 1.65 into their titles will now find improved functionality when their games are run on Linux via Proton. This ensures better support for features such as multiplayer, achievements, and other Steam services, aiming to provide a more stable gaming experience for users.